Compilare: user.cpp: In function ‘int main()’: user.cpp:91:10: warning: unused variable ‘c’ [-Wunused-variable] char c; ^ user.cpp:93:22: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s1,1000,in); ^ user.cpp:94:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d\n",&n); ^ user.cpp:96:20: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(v,100,in); ^ user.cpp: In function ‘bool termen()’: user.cpp:14:5: warning: ‘val’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(x==true) ^ user.cpp:41:10: note: ‘val’ was declared here bool val,semn=0; ^